Improvement in nozzles for hardening dies



J. B. HARMSTEAD. v Nozzle for Hardening Dies.

No. 213,194. Patented Mar. 11,1879.

WITNESSES: I I INVENTOR: am JMZ, w L7WMV- BY v ATTORNEYS.

N. PETERS, FHOTD-UTHOGRAPHER. WASHINGTON D C UNITED TATESPATENT EnronJOSEPH B. HARMSTEAD, OF SAN FRANCISCO, CALIFORNIA.

IMPROVEMENT IN NOZZLES FOR HARDENING DIES.

Specification forming part of Letters Patent No. 213,194, dated March11, 1879; application filed November12, 1878.

To all whom it may concern:

Be it known that I, J osnrn B. HARMSTEAD, of San Francisco and State ofCalifornia, have invented a new and Improved Nozzle for Hardening Dies,of which the following is a specification In the process of hardeningdies that are used for stamping coins and medals, the dies are subjectedto the action of water, and as the whole outer surface of the die isexposed to the water, that portion cools rapidly and before the centralportions. The result of this unequal cooling is, that the dies crack andscale, especially at the sharp corners of the butt of the die.

The object of my invention is to prevent cracking and scaling of thedies by cooling the die equally in every part during the hardeningprocess.

My invention consists in a nozzle of peculiar construction for holdingdies, which noz zle prevents direct contact of the water with the buttof the die, and the hardening process is thereby rendered complete andequal from the face to the butt. The device is particularly designed foruse in mints where money is coined.

In the accompanying drawing my improved nozzle is shown by an elevationand partiallysectional view.

Similar letters of reference indicate correspondin g parts.

A represents the main body of the nozzle, that is made of brass or othermetal. The lower end, I), is made smaller than the main portion, and isprovided with an interior thread, as shown, for attachment of the nozzleto a water-pipe. The body A is-hollow, and the water which entersthrough the end I) is discharged by the openings 0 around the upperpart.

(Z is a rim or flange for turning the water downward as it isdischarged.

The die (represented at e) is held centrally at the upper part of thenozzle A by the tapering inner ring, f, that is formed in one piece withthe body A, or as a separate piece and inserted. The upper end of thering f is flaring, and closes the upper end of the nozzle around theedge. The inner surface of ring f conformsto the shape and size of thedie 6, so that the die, when inserted, will be held, as shown, with itsbutt-end covered by the sides of ring f, and its face and adjacentsurfaces ina position where they will be exposed to direct contact withthe water passing through the chamber is of the nozzle.

h is a cover or cap upon the top or nozzle A, over the ring f, and it isheld in place by lugs or a screw-thread in its rim, that engages with athread on the body.

i is a screw-pin in a threaded hole at the center of cover h, which pint may be screwed down so that its lower end will rest upon the die 0 andprevent it from rising.

In using the described device the water will cool the face of the diefirst, and the up- I per part or butt, being protected from directcontact, will retain the heat and cause a gradual cooling from the faceto the butt. Thereby the surface and edges will not crack or chip byunequal contraction of the steel.

I do not limit myself to the details of construction set forth, as theprotection of the butt of the die from contact with the water may beobtained by a nozzle of different shape.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. A nozzle receiving water at the bottom,discharging it at holes 0 near the top, and provided with a centralupwardly-fiarin g dieholder, f, extending below said holes 0, as shownand described.

2. The combination, with a centrally-flaring die-holder, f, in thenozzle A, of a cover, h, having central nut, and a screw, 71, that worksthrough said nut, as and for the purpose specified.

JOSEPH BBECK HARMSTEAD.

Witnesses: I

GEORGE E. Donns, It. W. BoLLnN.

